Carbureter.



0.0. B ULOOK'. GARBURETER.

APPLICATION FILED APR. 6; 1911.

Patented Mar. 5, 1912.

za Q A Z l v z y crimes 0. Bullock, or CLEVELAND, omo.

-a citizen of the United States, residing at GARBURETER.

To all ivhom it may concern Be it known that I, CHARLES O. BULocK,

Cleveland, in the county of Cuyahoga and State of Ohio, have invented acertain new and useful Improvements 'in-Carbureters, of

whichth'e followin is a full, clear, and exact description, reerencebeing had tothe accompanying drawings.

This invention relates use with'explcsionengines and has for its objectthe; revision of a device of this character -w ich shall exhibit greateconomy in the use of liquid fuel and shall at all times deliver to" theengine a properly constituted explosive mixture independent of theengines speed. Another object of the invention. is the provision of adevice of this character wherein the mixture of ,fuel and airshall bemaintained at substantially the same richness at all times whilepermitting the adjustment of the quantity of such mixture by 'means 9fthe manipulation of' a single valve and 'furtherlobjects and advantageswill become apparent in the course of the following description andclaims.

One embodiment of my invention is illustrated inflthedrawingsaccompanying and forming apartof this specification, where.

1n: a i

Figure 1 is a longitudinal vertical cross sectional view through acarbureter built. in-

accordancexwith my invention and Fig. 2

is a detailside elevation of a portion of the mixing chamber and outletbranch.

Describing the parts by reference characters; my carburetor comprises aninteriorly cylindrical casing lhaving near its upper end an annularpassage 2, and having at its "lower end an axial fuel supply nozzle3.fuel supply nozzle is connected by IllQEtliS of a'duct- 4 with agasolene reservoir 5 provided with means such as a float 6.

and float valve 7 for maintainingthe level of the fuel liquid just belowthe discharge orifice of the nozzle 3. Fluid fuel is supplied ,to thisreservoir by means of a'pipe not shown) attached to the connection 8.

djacent the nozzle 3, the casing 1 isformcd with an air inlet port 10and between this port and the passage 2 is formed an auxil- .1ary airinlet. port" 11. I Slidahly mounted within the casing 1 is a hollowpiston 12 having between its ends an exterior annular Specification ofLetters Patent. Application filed April 6, 1911. Serial m. 619,197.

to carbureters"; for

Patented Mar. 5, 1912.

groove or recess 13 adapted to register, with the auxiliary air inletport 11 in all positions of the piston, and communicating with. thehollow interior of the piston by ports 14. Near its upper end the sidewalls of this piston are formed with laterally opening ports 15 adaptedto be brought into reg isterwith the annular passage 2 when the pistonis in its extreme depressedposition as illustrated in Fig. 1, and to -bebrought out of register therewith when the piston is raised. This pistonis provided with an operating rod 16 projecting through the aperturedcover 17of the chamber and there connected to an operating lever 18. Inthe embodiment shown this lever is illustrated as of the bell cranktype, having its shorter end 19 articulated to the end of the piston rodand having the angle of its elbow pivoted to a. link 20, the other endof which is pivoted to lugs 21 formed on the cover. -To the end of theoperating arm of this lever is connected an operating rod (not shown)which leads to a position where it maybe readily reached bythe operator. The lower end of this piston is interiorly contracted as shownat 24 and a carbure'ting tube 25 having a flaring or bell shaped portion26 at its lower end is sei cured therein. .The upper end of the noz,-zle 3 projects upwardly into the flaring portion of this tube and hasits exterior tapered at 27 preferably at a less angle than the angle ofthe bell 26 for a purpose to be hereinafter described. This carburetingtube is preferably formed with. an interior annular rib 28 substantiallyat the inner endofthe flaring portion 26.

The nozzle 3 is preferably secured 'in a vertical 'iuteriorlycylindrical threaded" sleeve 30 being introduced from within the casingand secured in place by a locked nut 31.- Radial ports 32 connect thecentral orifice thereof with the duct 4, and a needle valve 33 permitsthe adjustment of the pas sage therethrough, leakage around the needlevalve being prevented by the gland 34.

The auxiliary air admission port 11 communicates with an extension 37carried by the casing and having an aperture 38 formedin thewallthereof. Secured in this aperture is a spider 39 having a centralguiding sleeve 40 in which is slidably mounted a valve stem 41 carryinga disk valve 42.

This valve is arranged to seat against the the valve.

inside of the spider 39, and the further end f It will benoted thatthere artfour ad- 4:1 of the valve stem'is preferably carried,

across the extension 37 and mounted in a recess 43 .formed in thefurther wall thereof,

This recess has. a longitildinal groove 43* in its wall and the end4190f the valve'stem I fits snugly in the recess so as to form a dashpotthat shall preventflchattering of The outside of ;the sleeve 40 isthreaded to receive an adjusting nut 44 between the upper end of whichand a collar 45fcarried by the valve stem a compression spring 46 isplaced. The nut 44 is held against accidental displacement by means ofthe locking spring 47. WVith this construction it is obvious that asufficient decrease of pressure Within the carburetor will cause thevalve 42 to open against the pressure of the spring 46, and the pressureof the spring 46 can be adjusted by means of the nut 44.

The annular passage 2 communicates with a laterally extending branch 50preferably formed integral-with the casing 1 and having at its upper endan open mouth 51 adapted to be connected to the inlet pipe of e anexplosion engine.

The operation of the device is as follows: It is obvious that the mainair inlet port 10 is always open and that the interior of thexpiston 12is always in communication with'the auxiliary air inlet port 11. Withthepiston '12 in'the position shown in Fig. 1 t h full suction of theengine will be transmittted to the carbureter because of the completelyopen condition of the ports 15. At thesame timethe air inlet aperturebetween the nozzle 3 and inlet iltube 25 is at its smallest extent, thuscreating a maximum amount of suction upon the inlet noz zle 3 andcausing the maximum amount of fuel tobe delivered therethrough. Theremainder of the air necessary for the proper combustion of the fuelcharge is admitted through the auxiliary air inlet valve 42, the tensionof the spring 46 being. suitably adjusted to permit this action. If thepiston 12 be raised, the effect-is twofold; the area of the inlet ports15 is reduced, and the flaring portion 26v of the carburet'ing tube-Furthermore, I prefer to equip the cover 17 of the casing With'a setscrew 53 so that the amount of closing of the ports'l5 can be limited toexactly that pointfat which the eng ne will run smoothly at its veryslowest speed.

justments possible [with my .carbureter:

first, adjustment of the fuel supply by means of the needle valve'33;second, adjustment of the suction upon the nozzle 3 by moving thecarbureting tube 25; third, the'adjustment of the spring 46 determiningthe pres- 'surerequired to open ,the auxiliary air inlet most economicalresults are obtained by opcrating the engine at the; highest speed at.vrhich-it is normally to run, meanwhile clos ing the needle valve 33 tothe farthest point possible without impairing the running of the engine.The spring46 is adjustedatthe same time so as to admit the-largestquantity of air to the cylinder that is permissible. The piston 12 isthen moved so as to slow the engine down and the carbureting tube 2.5adjusted so as to cause the suctionupon the nozzle 3 to decrease at theproper ratio.

11 may -'be necessary after this is done to read'ust the valve '33 andspring 46, but a 9 few trials will adjust my carbureter soas to cause itto operate an engine smoothly at allspeeds and With the greatestpossible economy of fuel. 0

While I have shown and described the auxiliary air inlet port aspositioned be-- tween the main air inlet and mixture outlet ports, it isobvious that it could be placed beyond the mixture outlet port withoutchanging the operation of the carbureter.- 5 lt is sufficient if thisport be in communication with the interior of the piston at-the time.when the suction therein is so great that the passage between thecarbureting tube and the nozzle is insufficient to deliver a sufficientquantity of air to combine with the charge. Furthermore, While I havenecessarily described my invention in detail, I do not propose to belimited to such details except as the same may be positively in- 5cluded in the claims hereto annexed,'or may be rendered necessary by theprior state of the arts Having thus described my invention, WhatI claimis:

1. In 'a carbureter, in combination, a cy.- lindrical chamber having amain air inlet port at one end, a mixture outlet port, and w anauxiliary air inlet port, a hollow piston slidably mounted in saidcylinder and 12:, adapted when moved away from said air inlet port toclose said mixture outlet port, the interior of saidpiston being alwaysin communication with said auxiliary air inlet port, a carbureting tubecarried by said 130 piston adjacent said air'vinlet port and havmg; aflaring outer end, a fluid fuel supply nozzle carried by said casingadjacent said air inlet port andprojecting into said carap'ex, means forsupplying liquid fuel to semi-nozzle, a spring pressed valve assc ated;with said auxiliary a rinlet port and controlling the-supply'of airthereto, and meansv for adjusting the pressureat which saidfvalve opens.y -2.- In a carburetor, in combination an '.elongated chamber having amain air inlet port at one end, a mixture, outlet port, and

anauxillary air inlet port, a hollow piston slidably mounted in saidchamber and aidapted when moved away from said air inlet port to closesaid mixture outlet, port, the interior of said piston being always incommunication with said auxiliary air inlet port and the solecommunication lietween allsaid'ports being through the interior of saidpiston, a carburetingtube carried by said plston'adjacent said air inletport and justing said tube along said piston, a fluid fuel .supplynozzle carried by said casing adjacentsaid air inlet port and pro ectinginto said carbureting'tube, means for sup sition'and to be movedupwardly a suflicient distance to completely close said; outlet port, acarbureting tube carried by the lower end of said piston andcommunicating with said maincalr inlet port, a fluid .fuel supply 1nozzle carried by said casing and projecting into said carbureting tubein all positions of said iston, and a pressure operated valve associatedwith said auxiliary air inlet port and adapted to permit-the entrance ofa Seconda'ry supply of air thereto dependent upon the amount of suctionin said chamber, said auxiliary air, inlet port being always incommunication with the interior of said pis- 4. In a carbureter, incombination, achamher having a main air inlet port at one end, a mixtureoutlet port adjacent the other end,

1 a hollow piston slidably mounted in said 7 chamber and adaptedWhenmoved away a from said air inlet port to close said mixture ;@outletport, a carbureting tube carried lay said piston-adjacent said air inletport an haybureting tube, said nozzle having a tapered having aflaring'outer end, means for adarranged so thg81d car ing a flaring end,a fluid fuel supply nozzle carriedby said casing adjacent said airinlet port and projecting into said carbureting tube, the apex of saidnozzle being tapered at a less degree than the flared end of said tube,and a fluid fuel supply reservoir communicating with saidnozzle.

5. In a carbureter, in combination, an upright cylindrical chamberhaving a mainair inlet port adjacent its lower end, a mixture outletport spaced from its upper end, and an auxiliary air inlet port, ahollow slidable piston in said cylinder and having ports in its walladapted to register with said mixture outlet. port when said piston isat its lowest position and to move out of registry therewith as saidpiston is raised, a carbureting tube carried by the lower'end of saidpiston and communicating with said main.

air inlet port, a fluid fuel supply nozzle carriedby said casing andprojeoting'into said carbmrcting tube, a spring valve associated withsaid auxiliary air inlet port and adapted to permit the entrance of asecondary supf ply of air thereto dependent upon the amount of suctionin said chamber, said auxiliary air inlet port being always incommunication with the interior of said piston, means for adjusting theopening through said nozzle,

and means-for adjusting the tension of said, spring valve.

6. In a carburetor, elongated chamber havmg a main an inlet port atoneend, a mlxture outlet port ad a-,

"cent the other end, and a fluidfuel supply nozzle adjacent said airinlet port, a hollow piston slidable in said. chamber and having portsin its wall adapted to register with said mixture outlet port, and acarbureting tube surrounding said nozzle and communicating with saidmain air inlet port, said piston being arranged to draw said carburet:'ing tube away from said nozzle as said ports are movedout of registerwith said mixture outlet passage, the relative positions of said tubeand nozzle being such that said tube can never be withdrawn entirelyfrom said nozzle.

in combination, an i 7. In a carburetor, in combination, an'

elongated chamber having a main air inlet port at one end, a mixtureoutlet port, and an auxiliary air inlet port, a fluid supply nozzlecarried by said casing adjacent said main air inlet port, means forsupplying fluid fuelto said nozzle, a hollow piston slidable in said,

chamber and having ports in its wall adapted to be brought into registerwith said mix ture outlet'port and having ports in-its wall.-

always in communication with s'aid auxili-.-

ary air inlet port, a carbureting tube adjllSb ably carried by saidpiston and having .a.

flaring end surrounding said fuel supply nozzle and being in freecommunication not said main air inlet port, .sald pistonv beingiuret-ing tube will be drawn partly away from said nozzle as saidmixture outlet ports are closed and the length of said tube and nozzlebeing such. that they can never be drawn'entirely away- 8. In acarbureter, in combination,-a casing having an air-inlet port and amixture. outlet passage, a taperingyfuel supply nozzle in said casingadjacent sa d'inlet port,a'n adjusting valve in said nozzle, a valve forsaid mixture outlet passage, a carburetlng tube-m v said casing'andsurrounding said nozzle for causing the air enteringsaid inlet porttocreate a suction upon said nozzle, sa-lditube 1 having a cylindricaliiortion beyond the end- 20 of -'the'nozz1e, aflaring end surroundingsaid nozzle, and an'inwardly projecting rib at the junction of saidcylindrieal'and flaring por- 1 tions; and means for drawing said tubeaway from said nozzle as said Valve is closed 25 so as to increase theopening therethrough and to decrease the suction thereupon.

' iIn testimony whereof, I hereunto aflix m'ysignature in the presenceof two Witnesses.

- CHARLES OfBULOCKh HAROLDEI Si ter-1a,.

